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expansion tank
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  1. X3 F25 (2011 - 2017)
    2011 BMW X3 xDrive28i with N52 Engine and I'm losing a very small amount of coolant. Expansion tank hose was getting rubbed by wiring harness and was seeping a very small amount of coolant from the damaged area. There were white spots below. Anyone else every experienced this? Made a video of...
  2. X1 E84 (2011 - 2015)
    I have a 2014 BMW X1 Sdrive. I purchased about a month ago, it had a great service record... always serviced at the dealership on time. So everything appeared great, until I was driving up to Park City, Utah. The car over heated I pulled over and had it taken back to my house. It pulled the code...
  3. X3 E83 (2004 - 2010)
    2004 BMW X3, 6 speed manual transmission. Coolant leak at bottom of expansion tank, slow drip when cold, but gushes when the connector is pushed. Check out the video / gif. Drip appears to stop once engine warms up. Hoping its just o-rings, but not sure if the flex in the mount / connector is...
  4. E85 / E86 Z4 (2003-2008)
    Hi All, New member (actually for my son's car). The car is a 2006 Z4 3.0Si. I started replacement of the expansion tank due to a leak and when I was about to install the new tank I found the thermostat for the trans oil cooler is broken. I've ordered the part and in the meantime want to...
  5. E90/E91/E92/E93 (2006 - 2013)
    It started with a split expansion tank, which I replaced with after market. The upper vent hose wouldn't seal over the fitting because the o-ring was not flexible after 11 years. O-ring was 12mm ID x 3 mm thick (18mm OD) and is not readily available through any channels in less than several...
  6. E46 (1999 - 2006)
    Okay I'm going to make this short and sweet the housing "that doesn't need to be replaced" (see picture) I chipped off a little piece off the top while trying to get the bottom half of the broken thermostat out. will that matter when I go to put new reservoir on?? with the sealing. So in...
  7. E39 (1997 - 2003)
    Hi Folks; I replaced my radiator, thermostat, cooling lines and fan a few months ago. I used the zionsville kit with the 2 speed electric fan. So far it's worked great, temps are good and it's tight as a drum with no leaks. Only problem is I get a "Check coolant level" warning on every start...
  8. E60 / E61 (2004 - 2010)
    Hello everybody, I am new to BMW and this forum, please bear with me while I explain the situation. My brother recently bought BMW 5 series 523i 2007 model, it has 60k miles on it. I don't know what was he thinking before buying it as ever since we got it I see issues after issues. We got it...
  9. E60 / E61 (2004 - 2010)
    Hey guys, The patient: 2008 550i, Manual Transmission, 72,500 miles The Symptoms: The car threw a Low Coolant warning so I check the tank and sure enough it was low. At this point I was 85 miles from home so I figured it was a slow leak because we made the trip on Friday night. I topped it...
  10. E39 (1997 - 2003)
    Hey guys, I recently picked up $800 worth of cooling system components from Zionsville Autosport. This included: - a Stewart/EMP high-flow, stainless steel water pump ($195) - Zionsville aluminum fan shroud + Zionsville welded aluminum expansion tank ($346.50) - SPAL 16-inch fan + "Auxiliary...
  11. X3 E83 (2004 - 2010)
    Here are the lessons I learned while changing my Expansion Tank (08 X3/E83) Global Imports Atlanta takes returns on unused parts - Level Sensor, Cap, Transmission Thermostat. Buy everything and return what you don't need/break Lower Hose can be difficult to re-seat: Give it several good tugs...
  12. 7 Series - E38 (1995 - 2001)
    Hi all, new to the BMW world. I just picked up a 2001 740il. Love the car but last week the bleeder screw broke in half and leaked coolant everywhere. I replaced the screw super cheap and thought I fixed the problem until the following day the expansion tank cracked. I read up online and...
  13. E46 (1999 - 2006)
    Hey. I have a 04 BMW 325ci. I've noticed that there was dry coolant when I had popped my hood around my expansion tank etc. Seems that I'm losing MPG & that my car isn't accelerating as fast IMO. I've noticed lil wet spots around the expansion tank and seems to me that it's leaking from the...
  14. E46 (1999 - 2006)
    I've searched the forums but can't find an answer to my question. I very recently replaced my radiator because it had a little hairline crack that was leaking. So I changed that and also had to replace the thermostat so it wouldn't overheat. I then had to replace the hose that goes from the ET...
  15. X3 E83 (2004 - 2010)
    Hello all. I know we have heard the horror stories of the old dreaded crack, whiz, or steam everywhere. I myself have replaced this part 2 times in the last two years. being that i dont take this car out of state much and I figured it was the exterme fluctuation in Temperature here (IL) during...
  16. E90/E91/E92/E93 (2006 - 2013)
    Hey everyone, I got a tough one. Idk if any of you know of common issues I may not be aware of but here's my situation. My car has been over heating at highway speeds. If I drive at 45 mph or less, my car can drive all day without any problems. It's the second that I go 60+ my car begins to...
  17. E46 (1999 - 2006)
    I just bought a used BMW 330i with 120000 miles on it, and I am absolutely loving it so far. Just yesterday, however, my coolant fill light came on and after checking under the hood I didn't notice anything wrong. I checked under the hood today, and i saw this: From what I'm reading online, it...
  18. E90/E91/E92/E93 (2006 - 2013)
    Today I was in a parking lot with the car idling (for about 45min on a phone call) and the low-coolant warning came on all of a sudden. I opened the hood and there was a huge puddle of coolant under the expansion tank and on the pavement. Note that I put in a new thermostat (BEHR) and water pump...
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